scholarly journals Study on Flexural Properties of Tubular Underwater Inflated Structures Filled with Hydrogel Beads

2019 ◽  
Vol 8 (2) ◽  
pp. 48-54 ◽  
Author(s):  
Yanjun Li ◽  
Radivoje Stankovic ◽  
Bing Ouyang ◽  
Tsung-chow Su
Keyword(s):  
Young’S Modulus ◽  
Physical Characteristics ◽  
Flexural Properties ◽  
Flexural Test ◽  
Inflatable Structures ◽  
Plastic Deformations ◽  
Hydrogel Beads ◽  
Test Tank ◽  
Test Platform ◽  
Elastic And Plastic Deformations

Underwater inflatable structures (UISs) are distributed in an initial folded state for ease of transportation and deployment. They are able to morph into their intended geometry upon arrival at their destination. This morphing/inflation process can be driven by hydrogel beads, which swell when they contact water. In this research, we study the physical characteristics of tubular UISs with different configurations (length, slenderness, beads density). We fabricated sets of tubular UISs with nylon sleeves filled with different amounts of hydrogel beads and built a flexural test platform mounted on the test tank for the bending experiment. This work provides the experimental Young’s modulus of the tubular UISs under elastic and plastic deformations, and also discusses how the different configurations contribute to the tubular UIS’s stiffness.

Buckling of Columns in the Presence of Creep

1956 ◽  
Vol 7 (2) ◽  
pp. 125-134 ◽  
Author(s):  
Sharad A. Patel
Keyword(s):  
Critical Time ◽  
Secondary Creep ◽  
Plastic Deformations ◽  
Creep Buckling ◽  
Elastic And Plastic Deformations

SummaryThis paper is concerned with the solution of the creep buckling of columns. Instantaneous elastic and plastic deformations, as well as the transient and secondary creep, are considered. Formulae for the critical time at which a column fails are presented for integral values of the exponents appearing in the creep law.

scholarly journals Estimation of the Influence of Compressed Hydrogen on the Mechanical Properties of Pipeline Steels

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6085
Author(s):  
Victor I. Bolobov ◽  
Il’nur U. Latipov ◽  
Gregory G. Popov ◽  
George V. Buslaev ◽  
Yana V. Martynenko
Keyword(s):  
Mechanical Properties ◽  
Stress State ◽  
Pressure Range ◽  
Operating Pressure ◽  
Gas Pipelines ◽  
Plastic Deformations ◽  
Hydrogen Saturation ◽  
Elastic And Plastic Deformations ◽  
Potential Losses ◽  
Pipeline Wall

Consideration of the possibility of transporting compressed hydrogen through existing gas pipelines leads to the need to study the regularities of the effect of hydrogen on the mechanical properties of steels in relation to the conditions of their operation in pipelines (operating pressure range, stress state of the pipe metal, etc.). This article provides an overview of the types of influence of hydrogen on the mechanical properties of steels, including those used for the manufacture of pipelines. The effect of elastic and plastic deformations on the intensity of hydrogen saturation of steels and changes in their strength and plastic deformations is analyzed. An assessment of the potential losses of transported hydrogen through the pipeline wall as a result of diffusion has been made. The main issues that need to be solved for the development of a scientifically grounded conclusion on the possibility of using existing gas pipelines for the transportation of compressed hydrogen are outlined.

Numerical Analysis for Influence of Plastic and Elastic Deformation of Rough Surfaces on PEHL for Line Contacts

Tribology ◽  
2005 ◽  
Author(s):  
R. J. Niu ◽  
P. Huang
Keyword(s):  
Plastic Deformation ◽  
Film Thickness ◽  
Hydrodynamic Lubrication ◽  
Paper Analysis ◽  
Line Contact ◽  
Plastic Deformations ◽  
Rolling Contacts ◽  
Line Contacts ◽  
Elastic And Plastic Deformations ◽  
Strain Relationship

In the present paper, analysis of elasto-plasto-hydrodynamic lubrication (PEHL) in the line contact is carried out to investigate the effect of heavily loaded roll-over on the change in profile of indents. The pressure and film thickness profiles are obtained to solve the Reynolds and film thickness equations simultaneously. And, both the elastic and plastic deformations of the contact, featured with an indent, have been considered. A multi-grid numerical algorithm used in EHL of line contacts is modified and then used for the oil lubricated rolling contacts. In the program, stress and plastic deformation of the indent profile are calculated with the hardening plastic stress-strain relationship according to the theories of plasticity when pressure excesses the yield stress. The results, with and without considering plastic deformation, are compared to show the different influences on the pressure and film thickness. Analysis shows that since the plastic deformation will change the surface roughness, it will significantly change the pressure but film thickness.

Elastic and plastic deformations of nickel nanowires under uniaxial compression

2005 ◽  
Vol 30 (1-2) ◽  
pp. 45-50 ◽  
Author(s):  
Baolin Wang ◽  
Daning Shi ◽  
Jianming Jia ◽  
Guanghou Wang ◽  
Xiaoshuang Chen ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Plastic Deformations ◽  
Nickel Nanowires ◽  
Elastic And Plastic Deformations
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